Date.prototype.format = function(format) {
	var o = {
		"M+": this.getMonth() + 1, //month  
		"d+": this.getDate(), //day  
		"h+": this.getHours(), //hour  
		"m+": this.getMinutes(), //minute  
		"s+": this.getSeconds(), //second  
		"q+": Math.floor((this.getMonth() + 3) / 3), //quarter  
		"S": this.getMilliseconds() //millisecond  
	}
	if(/(y+)/.test(format)) format = format.replace(RegExp.$1,
		(this.getFullYear() + "").substr(4 - RegExp.$1.length));
	for(var k in o)
		if(new RegExp("(" + k + ")").test(format))
			format = format.replace(RegExp.$1,
				RegExp.$1.length == 1 ? o[k] :
				("00" + o[k]).substr(("" + o[k]).length));
	return format;
}

function getFormatDate(l, pattern) {
	var date;
	if(l == undefined) {
		date = new Date();
	} else if(l == 0) {
		return "";
	} else {
		date = new Date(parseInt(l));
	}
	if(pattern == undefined) {
		pattern = "yyyy-MM-dd hh:mm:ss S";
	}
	return date.format(pattern);
}